diff options
Diffstat (limited to 'arch/powerpc/kernel/head_booke.h')
-rw-r--r-- | arch/powerpc/kernel/head_booke.h | 118 |
1 files changed, 77 insertions, 41 deletions
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h index aefafc6..b0461be 100644 --- a/arch/powerpc/kernel/head_booke.h +++ b/arch/powerpc/kernel/head_booke.h @@ -43,9 +43,7 @@ SAVE_2GPRS(7, r11) /* To handle the additional exception priority levels on 40x and Book-E - * processors we allocate a 4k stack per additional priority level. The various - * head_xxx.S files allocate space (exception_stack_top) for each priority's - * stack times the number of CPUs + * processors we allocate a stack per additional priority level. * * On 40x critical is the only additional level * On 44x/e500 we have critical and machine check @@ -61,36 +59,37 @@ * going to critical or their own debug level we aren't currently * providing configurations that micro-optimize space usage. */ -#ifdef CONFIG_44x -#define NUM_EXCEPTION_LVLS 2 -#else -#define NUM_EXCEPTION_LVLS 3 -#endif -#define BOOKE_EXCEPTION_STACK_SIZE (4096 * NUM_EXCEPTION_LVLS) /* CRIT_SPRG only used in critical exception handling */ #define CRIT_SPRG SPRN_SPRG2 /* MCHECK_SPRG only used in machine check exception handling */ #define MCHECK_SPRG SPRN_SPRG6W -#define MCHECK_STACK_TOP (exception_stack_top - 4096) -#define CRIT_STACK_TOP (exception_stack_top) +#define MCHECK_STACK_BASE mcheckirq_ctx +#define CRIT_STACK_BASE critirq_ctx -/* only on e200 for now */ -#define DEBUG_STACK_TOP (exception_stack_top - 8192) +/* only on e500mc/e200 */ +#define DEBUG_STACK_BASE dbgirq_ctx +#ifdef CONFIG_PPC_E500MC +#define DEBUG_SPRG SPRN_SPRG9 +#else #define DEBUG_SPRG SPRN_SPRG6W +#endif + +#define EXC_LVL_FRAME_OVERHEAD (THREAD_SIZE - INT_FRAME_SIZE - EXC_LVL_SIZE) #ifdef CONFIG_SMP #define BOOKE_LOAD_EXC_LEVEL_STACK(level) \ mfspr r8,SPRN_PIR; \ - mulli r8,r8,BOOKE_EXCEPTION_STACK_SIZE; \ - neg r8,r8; \ - addis r8,r8,level##_STACK_TOP@ha; \ - addi r8,r8,level##_STACK_TOP@l + slwi r8,r8,2; \ + addis r8,r8,level##_STACK_BASE@ha; \ + lwz r8,level##_STACK_BASE@l(r8); \ + addi r8,r8,EXC_LVL_FRAME_OVERHEAD; #else #define BOOKE_LOAD_EXC_LEVEL_STACK(level) \ - lis r8,level##_STACK_TOP@h; \ - ori r8,r8,level##_STACK_TOP@l + lis r8,level##_STACK_BASE@ha; \ + lwz r8,level##_STACK_BASE@l(r8); \ + addi r8,r8,EXC_LVL_FRAME_OVERHEAD; #endif /* @@ -104,22 +103,36 @@ #define EXC_LEVEL_EXCEPTION_PROLOG(exc_level, exc_level_srr0, exc_level_srr1) \ mtspr exc_level##_SPRG,r8; \ BOOKE_LOAD_EXC_LEVEL_STACK(exc_level);/* r8 points to the exc_level stack*/ \ - stw r10,GPR10-INT_FRAME_SIZE(r8); \ - stw r11,GPR11-INT_FRAME_SIZE(r8); \ - mfcr r10; /* save CR in r10 for now */\ - mfspr r11,exc_level_srr1; /* check whether user or kernel */\ - andi. r11,r11,MSR_PR; \ - mr r11,r8; \ - mfspr r8,exc_level##_SPRG; \ - beq 1f; \ - /* COMING FROM USER MODE */ \ + stw r9,GPR9(r8); /* save various registers */\ + mfcr r9; /* save CR in r9 for now */\ + stw r10,GPR10(r8); \ + stw r11,GPR11(r8); \ + stw r9,_CCR(r8); /* save CR on stack */\ + mfspr r10,exc_level_srr1; /* check whether user or kernel */\ + andi. r10,r10,MSR_PR; \ mfspr r11,SPRN_SPRG3; /* if from user, start at top of */\ lwz r11,THREAD_INFO-THREAD(r11); /* this thread's kernel stack */\ - addi r11,r11,THREAD_SIZE; \ -1: subi r11,r11,INT_FRAME_SIZE; /* Allocate an exception frame */\ - stw r10,_CCR(r11); /* save various registers */\ - stw r12,GPR12(r11); \ + addi r11,r11,EXC_LVL_FRAME_OVERHEAD; /* allocate stack frame */\ + beq 1f; \ + /* COMING FROM USER MODE */ \ + stw r9,_CCR(r11); /* save CR */\ + lwz r10,GPR10(r8); /* copy regs from exception stack */\ + lwz r9,GPR9(r8); \ + stw r10,GPR10(r11); \ + lwz r10,GPR11(r8); \ stw r9,GPR9(r11); \ + stw r10,GPR11(r11); \ + b 2f; \ + /* COMING FROM PRIV MODE */ \ +1: lwz r9,TI_FLAGS-EXC_LVL_FRAME_OVERHEAD(r11); \ + lwz r10,TI_PREEMPT-EXC_LVL_FRAME_OVERHEAD(r11); \ + stw r9,TI_FLAGS-EXC_LVL_FRAME_OVERHEAD(r8); \ + stw r10,TI_PREEMPT-EXC_LVL_FRAME_OVERHEAD(r8); \ + lwz r9,TI_TASK-EXC_LVL_FRAME_OVERHEAD(r11); \ + stw r9,TI_TASK-EXC_LVL_FRAME_OVERHEAD(r8); \ + mr r11,r8; \ +2: mfspr r8,exc_level##_SPRG; \ + stw r12,GPR12(r11); /* save various registers */\ mflr r10; \ stw r10,_LINK(r11); \ mfspr r12,SPRN_DEAR; /* save DEAR and ESR in the frame */\ @@ -231,7 +244,7 @@ label: * the code where the exception occurred (since exception entry \ * doesn't turn off DE automatically). We simulate the effect \ * of turning off DE on entry to an exception handler by turning \ - * off DE in the CSRR1 value and clearing the debug status. \ + * off DE in the DSRR1 value and clearing the debug status. \ */ \ mfspr r10,SPRN_DBSR; /* check single-step/branch taken */ \ andis. r10,r10,DBSR_IC@h; \ @@ -262,17 +275,17 @@ label: lwz r12,GPR12(r11); \ mtspr DEBUG_SPRG,r8; \ BOOKE_LOAD_EXC_LEVEL_STACK(DEBUG); /* r8 points to the debug stack */ \ - lwz r10,GPR10-INT_FRAME_SIZE(r8); \ - lwz r11,GPR11-INT_FRAME_SIZE(r8); \ + lwz r10,GPR10(r8); \ + lwz r11,GPR11(r8); \ mfspr r8,DEBUG_SPRG; \ \ RFDI; \ b .; \ \ - /* continue normal handling for a critical exception... */ \ + /* continue normal handling for a debug exception... */ \ 2: mfspr r4,SPRN_DBSR; \ addi r3,r1,STACK_FRAME_OVERHEAD; \ - EXC_XFER_TEMPLATE(DebugException, 0x2002, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), NOCOPY, debug_transfer_to_handler, ret_from_debug_exc) + EXC_XFER_TEMPLATE(DebugException, 0x2008, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), NOCOPY, debug_transfer_to_handler, ret_from_debug_exc) #define DEBUG_CRIT_EXCEPTION \ START_EXCEPTION(DebugCrit); \ @@ -315,8 +328,8 @@ label: lwz r12,GPR12(r11); \ mtspr CRIT_SPRG,r8; \ BOOKE_LOAD_EXC_LEVEL_STACK(CRIT); /* r8 points to the debug stack */ \ - lwz r10,GPR10-INT_FRAME_SIZE(r8); \ - lwz r11,GPR11-INT_FRAME_SIZE(r8); \ + lwz r10,GPR10(r8); \ + lwz r11,GPR11(r8); \ mfspr r8,CRIT_SPRG; \ \ rfci; \ @@ -363,8 +376,31 @@ label: #define FP_UNAVAILABLE_EXCEPTION \ START_EXCEPTION(FloatingPointUnavailable) \ NORMAL_EXCEPTION_PROLOG; \ - bne load_up_fpu; /* if from user, just load it up */ \ - addi r3,r1,STACK_FRAME_OVERHEAD; \ + beq 1f; \ + bl load_up_fpu; /* if from user, just load it up */ \ + b fast_exception_return; \ +1: addi r3,r1,STACK_FRAME_OVERHEAD; \ EXC_XFER_EE_LITE(0x800, kernel_fp_unavailable_exception) +#ifndef __ASSEMBLY__ +struct exception_regs { + unsigned long mas0; + unsigned long mas1; + unsigned long mas2; + unsigned long mas3; + unsigned long mas6; + unsigned long mas7; + unsigned long srr0; + unsigned long srr1; + unsigned long csrr0; + unsigned long csrr1; + unsigned long dsrr0; + unsigned long dsrr1; + unsigned long saved_ksp_limit; +}; + +/* ensure this structure is always sized to a multiple of the stack alignment */ +#define STACK_EXC_LVL_FRAME_SIZE _ALIGN_UP(sizeof (struct exception_regs), 16) + +#endif /* __ASSEMBLY__ */ #endif /* __HEAD_BOOKE_H__ */ |